Sequence of selectors in @extend in SASS

The @extend directive can also be used to extend the selector sequence. See the following example:

Let's look at an example:

#menu .navbar {
	@extend div;
}
div {
	color: #0a0a4b;
	&:hover {
		text-decoration: underline;
	}
}

After compilation we got the following code:

div, #menu .navbar {
	color: #0a0a4b;
}
div:hover, #menu .navbar:hover {
	text-decoration: underline;
}

Tell me what the result of compiling the following code will be:

button {
	@extend link;
}

link {
	font-size: 10px;
	&:active {
		color: #f0ffff;
		background-color: #110c63;
	}
}

Tell me what the result of compiling the following code will be:

.main-text {
	font-family: Impact;
}

button {
	@extend link;
	font-size: 10px;
	@extend .main-text;
}

link {
	&:hover {
		color: #333333;
		background-color: #6d6d6d;
	}
}